Sonic The Hedgehog Open Source Project 0.04A is a ROM hack based on the original Sonic the Hedgehog for Sega Genesis. Its title highlights its open-source nature, meaning the source code is publicly available, enabling community contribution and further development. The version number 0.04A indicates an early stage of development, suggesting a work-in-progress with many aspects still under development. This project exemplifies collaborative development within the ROM hacking community, independent from Sega's official involvement.

Sonic The Hedgehog Open Source Project 0.04A

Sonic The Hedgehog Megamix (Hacking Contest 2005 Build)